Full TGIF Record # 73961
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Web URL(s):http://www.agry.purdue.edu/turf/report/2000/2000%20page%2060.pdf
    Last checked: 07/2001
    Requires: PDF Reader
Publication Type:
i
Report
Author(s):Latin, Richard
Author Affiliation:Turfgrass Pathologist, Department of Botany and Plant Pathology, Purdue University
Title:Managing take all patch
Section:Integrated pest management
Other records with the "Integrated pest management" Section
Source:2000 Annual Report - Purdue University Turfgrass Science Program. 2000, p. 60-62.
Publishing Information:[West Lafayette, IN]: Purdue University
# of Pages:3
Series:B-804
Keywords:TIC Keywords: Take-all patch; Disease control; Agrostis stolonifera; USGA recommendations; Sand-based root zones; Gaeumannomyces graminis var. avenae; Spring; Disease severity; pH; Soil amendments; NPK fertilizers; Fungicides; Heat stress; Soil temperature; Root growth; Root damage; Water uptake; Thatch control; Irrigation; Traffic control; Mowing height
Abstract/Contents:Presents a study "to determine the effects of pre-plant and post-plant treatments on the establishment and spread of take all patch of creeping bentgrass in a sand-based root zone prepared accourding to USGA specifications. The research described herein is part of a multi-year project to investigate factors that influence the development of take all patch and is funded by the Golf Course Superintendents Association of America." Results include "beginning in spring, 1999, take all patch symptoms were expressed precisely at the inoculation sites in many of the experimental plots. In 1999, symptom expression was evident from early Apr through June. In 2000, symptoms were not observed until late May, then subsided a month later. Based on the results to date, the following conclusions may be drawn: In 1999, slight differences in take all patch severity occurred where pH was adjusted by soil amendments during spring 1998. Mildest symptoms occurred in plots with the lowest (5.5) target pH. The pre-plant pH adjustment treatment had no effect on disease severity as it occurred in 2000. Take all patch symptoms were more severe in the treatment that included a balanced fertilizer (18-4-10) and no fungicide than in nearly all other treatments for both years. The acidifying fertilizer (21-0-0) and fungicide treatments resulted in significant disease suppression in 1999, but had less of an effect in 2000. Plots treated with fungicide resulted in less severe symptoms than unsprayed plots in almost all cases in both years. Although it was expected that symptom expression would increase during periods of heat stress, no changes in plot appearance occurred during the early July 1999 heat wave. In fact, symptoms did not reappear in summer or fall of 1999. Initial outbreaks were observed nearly six weeks later than expected in 2000." Suggests that "if fungicides are used for take all patch control, then effective products must be applied when the pathogen is active. The take all patch pathogen is active when soil temperatures in the upper 2 inches of the soil are between 55 and 70°F. Fall and spring applications are advisable. Summer applications are not likely to do much good if the fungus is dormant in the soil and plant roots. Creeping bentgrass can recover from take all patch infection only if new root growth is extensive enough to compensate for roots damaged by infection. Practices that encourage vigorous root growth are most likely to lessen the effects of the disease. Symptoms of take all patch continue through the summer because roots are damaged to the extent that water uptake becomes limited. Plants continue to wilt and die. Practices that reduce summer stress may lessen symptom severity. These include thatch management, proper irrigation, traffic control to reduce compaction, and adjusting mowing height."
Language:English
References:0
Note:"Not for publication without permission"
Tables
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Latin, R. 2000. Managing take all patch. Annu. Rep. Purdue Univ. Turfgrass Sci. Progr. p. 60-62.
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http://www.agry.purdue.edu/turf/report/2000/2000%20page%2060.pdf
    Last checked: 07/2001
    Requires: PDF Reader
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MSU catalog number: SB 433.16 .I6 T87
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